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Visualizations of gas-assisted atomization of black liquor and syrup/water mixtures at elevated ambient pressures
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energy Technology Center.
2009 (English)In: Atomization and sprays, ISSN 1044-5110, E-ISSN 1936-2684, Vol. 19, no 10, p. 957-967Article in journal (Refereed)
Abstract [en]

Pressurized entrained flow high-temperature black liquor gasification (PEHT-BLG) is a novel technique to recover the inorganic chemicals and available energy in black liquor originating from kraft pulping. One of the key parts in the PEHT-BLG process is the spray atomizer where the viscous black liquor is disintegrated into a spray of fine droplets into the hot gasifier. In this study a high-speed photography system was used in order to visualize the spray formation of black liquor and syrup/water mixtures at elevated ambient pressures based on a conventional coaxially convergent gas-assisted atomizer. The main conclusion is that the breakup and atomization of black liquor by a gas-assisted atomizer is similar to that of a syrup/water mixture with similar physical properties. The observed difference in sphericity between black liquor and syrup/water may be explained by rapid cooling of the black liquor by the cool nitrogen gas at the nozzle exit, resulting in a sudden decrease in viscosity and possible skinning of the black liquor. Furthermore, it was found that an increased ambient pressure appeared to contract the spray to a more dense cloud of droplets compared to the corresponding atmospheric case. © 2009 by Begell House, Inc.

Place, publisher, year, edition, pages
2009. Vol. 19, no 10, p. 957-967
Keywords [sv]
Energiteknik
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:ri:diva-6972Scopus ID: 2-s2.0-72449153381OAI: oai:DiVA.org:ri-6972DiVA, id: diva2:964827
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2017-11-21Bibliographically approved

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